package com.example.demo.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

@Configuration
@EnableConfigurationProperties(TaskThreadPoolConfig.class)
public class AsyncTaskExecutePoolConfig {

    private final TaskThreadPoolConfig taskThreadPoolConfig;

    @Autowired
    public AsyncTaskExecutePoolConfig(TaskThreadPoolConfig taskThreadPoolConfig) {
        this.taskThreadPoolConfig = taskThreadPoolConfig;
    }

    @Bean
    public ThreadPoolTaskExecutor executor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(taskThreadPoolConfig.getCorePoolSize());
        executor.setMaxPoolSize(taskThreadPoolConfig.getMaxPoolSize());
        executor.setQueueCapacity(taskThreadPoolConfig.getQueueCapacity());
        executor.setKeepAliveSeconds(taskThreadPoolConfig.getKeepAliveSeconds());
        executor.setThreadNamePrefix(taskThreadPoolConfig.getThreadNamePrefix());

        //用来设置线程池中任务的等待时间，如果超过这个时候还没有销毁就强制销毁，以确保应用最后能够被关闭，而不是阻塞住。
        executor.setAwaitTerminationSeconds(taskThreadPoolConfig.getAwaitTerminationSeconds());

        //用来设置线程池关闭的时候等待所有任务都完成再继续销毁其他的Bean
        executor.setWaitForTasksToCompleteOnShutdown(true);
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }
}
